If you enjoyed the clandestine sex scenes between Pete Campbell and Rory Gilmore, we mean Beth Dawes, on “Mad Men” this season, you’ll be pleased to know that these two may be carrying on off set as well. Allegedly, Vincent Kartheiser and Alexis Bledel were spotted canoodling on a flight from JFK to LAX yesterday. Although they haven’t let on about the relationship, if it is true, we think it’s kind of cute. As long as neither of them are involved with other people and she doesn’t do it in fur, why not? BUT and this comes with a big BUT, dating your TV co-star is a risky move. No matter how many times we warn them, TV show stars keep falling in love with each other—knowing full well that if it doesn’t work out that they’re stuck working with their ex for seasons to come. Here are a few television showmance casualties. We hope Vincent and Alexis don’t succumb to the same fate. [ONTD]